Product category:
Analogue and Mixed Signal ICs
News Release from: Texas Instruments (April 2001-March 2006) | Subject: ADS1601 and ADS1602
Edited by the Electronicstalk Editorial
Team on 08 April 2005
ADCs are optimised for linear high-speed
operation
Two new high-speed, high-precision ADCs are ideal for demanding measurement applications in scientific instrumentation, ATE, data acquisition, medical imaging and vibration analysis.
Extending the portfolio of the industry's highest performing delta-sigma data convertors, Texas Instruments has added a new pair of high-speed, high-precision analogue-to-digital convertors (ADCs) to its Burr-Brown product line Optimised for very linear high-speed operation, the ADS1601 and ADS1602 are ideal for demanding measurement applications in scientific instrumentation, automated test equipment, data acquisition, medical imaging and vibration analysis
This article was originally published on Electronicstalk on 8 Nov 2004 at 8.00am (UK)
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The ADS1602 modulator samples input signals with a 40MHz clock, while the digital filter decimates the modulator output by 16 to provide high resolution 16bit output data at 2.5Msample/s over a serial interface.
Dynamic performance is excellent all the way up to the 1.23MHz passband transition.
THD is less than -101dB, SFDR is greater than 103dB, while SNR is greater than 91dB.
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The ADS1601 has the same advanced architecture and is optimised for applications requiring less aggressive datarates and lower power dissipation.
The ADS1601 features 1.25Msample/s datarate, 330mW power dissipation and unmatched high-speed performance: 92dB signal-to-noise ratio (SNR), -103dB total harmonic distortion (THD) and 105dB spurious-free dynamic range (SFDR).
The ADS1601 is pin-compatible with the ADS1602.
"The easy-to-use ADS1601 and ADS1602 provide superior performance (SNR, SFDR and THD) compared with competitive 16bit devices and allow customers to easily upgrade the performance of their designs", said David Russell, Strategic Marketing Engineer for TI's oversampling Data Convertor Products.
"The devices also represent the smallest, lowest power solutions within this performance segment".
The ADS1601 and ADS1602 use oversampling topology which reduces clock jitter sensitivity during the sampling of high-frequency, large amplitude signals by a factor of four over that achieved by Nyquist-rate ADCs.
A full-scale 3V differential input range makes out-of-range signals unlikely.
The on-chip decimation filter stop band extends to 38.6MHz (19.3MHz for the ADS1601), which greatly simplifies the anti-aliasing circuitry.
The modulator samples the input signal up to 40Msample/s (20Msample/s for the ADS1601), and the 16x decimation filter uses a series of half-band FIR filter stages to provide 75dB stop band attenuation and 0.001dB of passband ripple.
Output data are provided over a simple three-wire serial interface, with a -3dB bandwidth of 1.23MHz (615kHz for the ADS1601).
The output data's complementary format directly connects to DSPs, such as TI's TMS320T family, as well as FPGAs or ASICs.
A dedicated synchronisation pin enables simultaneous sampling with multiple ADS1601s or ADS1602s in multichannel systems.
Power dissipation is set by an external resistor and can be reduced when operating at slower speeds.
The devices operate from a +5V analogue supply and a +3V digital supply.
The digital I/O supply operates from +2.7 to +5.25V, enabling the digital interface to support a range of logic families.
All features are controlled by dedicated I/O pins.
The ADS1601 and ADS1602 are packaged in 7 x 7mm TQFP-48 packages and are available now from TI and its authorised distributors.
The ADS1601 is priced at $14.00 in 1000 piece quantities (suggested resale pricing).
The ADS1602 is priced at $23.00 in 1000 piece quantities.
Evaluation modules for both devices are available.
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